title: Methane and carbon dioxide emission from two pig finishing barns.
abstract: Agricultural activities are an important source of greenhouse gases. However, comprehensive, long-term, and high-quality measurement data of these gases are lacking. This article presents a field study of CH(4) and CO(2) emission from two 1100-head mechanically ventilated pig (Sus scrofa) finishing barns (B1 and B2) with shallow manure flushing systems and propane space heaters from August 2002 to July 2003 in northern Missouri. Barn 2 was treated with soybean oil sprinkling, misting essential oils, and misting essential oils with water to reduce air pollutant emissions. Only days with CDFB (complete-data-full-barn), defined as >80% of valid data during a day with >80% pigs in the barns, were used. The CH(4) average daily mean (ADM) emission rates were 36.2 +/- 2.0 g/d AU (ADM +/- 95% confidence interval; animal unit = 500 kg live mass) from B1 (CDFB days = 134) and 28.8 +/- 1.8 g/d AU from B2 (CDFB days = 131). The CO(2) ADM emission rates were 17.5 +/- 0.8 kg/d AU from B1 (CDFB days = 146) and 14.2 +/- 0.6 kg/d AU from B2 (CDFB days = 137). The treated barn reduced CH(4) emission by 20% (P < 0.01) and CO(2) emission by 19% (P < 0.01). The CH(4) and CO(2) released from the flushing lagoon effluent were equivalent to 9.8 and 4.1% of the CDFB CH(4) and CO(2) emissions, respectively. The emission data were compared with the literature, and the characteristics of CH(4) and CO(2) concentrations and emissions were discussed.
authors.affiliation: Dep. of Agric. & Biological Engineering, Purdue Univ., 225 S. University St., West Lafayette, IN 47907, USA. jiqin@purdue.edu
authors.forename: Ji-Qin
authors.initials: JQ
authors.lastname: Ni
authors.forename: Albert J
authors.initials: AJ
authors.lastname: Heber
authors.forename: Teng Teeh
authors.initials: TT
authors.lastname: Lim
authors.forename: Pei Chun
authors.initials: PC
authors.lastname: Tao
authors.forename: Amy M
authors.initials: AM
authors.lastname: Schmidt
mesh_terms: D000383:Agriculture; D000393:Air Pollutants / Q000737:chemistry*; D000397:Air Pollution / Q000517:prevention & control; D000818:Animals; D002245:Carbon Dioxide / Q000737:chemistry*; D006361:Heating; D006799:Housing, Animal; D006813:Humidity; D008372:Manure / Q000032:analysis; D008697:Methane / Q000737:chemistry*; D009822:Oils, Volatile / Q000737:chemistry; D013024:Soybean Oil / Q000737:chemistry; D013552:Swine; D014691:Ventilation
chemical_list: D000393:Air Pollutants; D008372:Manure; D009822:Oils, Volatile; D002245:Carbon Dioxide; D013024:Soybean Oil; D008697:Methane